In one photo, the 29-year-old flaunted her svelte figure (which bore no evidence of a tan—yet) in a tiny black two-piece under a striped beach cover-up as she gestured to a sign above her that read, "Schlitterbahn Welcomes The Prismatic World Tour."

"Thank you @schlitterbahn KC for hosting the kids on #theprismaticworldtour today!" she captioned the pic. "We can't wait to do our costume changes with our sunburns tomorrow!"

John Mayer's ex also posted a video of her tour team having fun in a pool. The Insta-vid showed the brunette beauty surrounded by four dudes making peace signs before sinking down into the water and making funny faces at the camera.

Just like Canadian cutie Nina Dobrev, Katy took a moment to partake in the ALS Ice Bucket Challenge while wearing a sexy bikini. On Tuesday she shared an Instagram video of herself being doused by ice water while standing on a faux pirate's ship.